PTPN22 - Tyrosine-protein phosphatase non-receptor type 22 - human protein (Function)
 
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PTPN22 »  Tyrosine-protein phosphatase non-receptor type 22   [ EC 3.1.3.48 ]
 
Protein also known as:  Hematopoietic cell protein-tyrosine phosphatase 70Z-PEP.
Gene name:  PTPN22
Entry whose protein(s) existence is based on evidence at protein level
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1 208 6
GENE REF ISO

Function

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Overview 
Acts as negative regulator of T-cell receptor (TCR) signaling by direct dephosphorylation of the Src family kinases LCK and FYN, ITAMs of the TCRz/CD3 complex, as well as ZAP70, VAV, VCP and other key signaling molecules. Associates with and probably dephosphorylates CBL. Dephosphorylates LCK at its activating 'Tyr-394' residue. Dephosphorylates ZAP70 at its activating 'Tyr-493' residue. Dephosphorylates the immune system activator SKAP2.  
4
  • CuratedUniProtKB
GO molecular function 
Kinase bindingdefinition[GO:0019900]  
  • ISSOrtholog Curator
Protein bindingdefinition[GO:0005515]  
4
  • IPIIntAct
  • IPIBHF-UCL
Protein tyrosine phosphatase activitydefinition[GO:0004725]  
3
  • IDAUniProtKB
  • IDABHF-UCL
SH3 domain bindingdefinition[GO:0017124]  
  • ISSOrtholog Curator
GO biological process 
Negative regulation of T cell activationdefinition[GO:0050868]  
1
  • IMPBHF-UCL
Negative regulation of T cell receptor signaling pathwaydefinition[GO:0050860]  
1
  • IDAUniProtKB
Peptidyl-tyrosine dephosphorylationdefinition[GO:0035335]  
3
  • IDAGOC
  • IEAInterPro 2 GO
  • IEAEC 2 GO
Phosphoanandamide dephosphorylationdefinition[GO:0035644]  
  • ISSOrtholog Curator
Protein dephosphorylationdefinition[GO:0006470]  
2
  • TASBHF-UCL
Regulation of B cell receptor signaling pathwaydefinition[GO:0050855]  
1
  • NASBHF-UCL
Regulation of innate immune responsedefinition[GO:0045088]  
1
  • ICBHF-UCL
Regulation of natural killer cell proliferationdefinition[GO:0032817]  
1
  • IDABHF-UCL
T cell differentiationdefinition[GO:0030217]  
  • ISSOrtholog Curator
Enzymatic activity 
This protein acts as an enzyme. It is known to catalyze the following reaction
EC 3.1.3.48: Protein tyrosine phosphate + H(2)O protein tyrosine + phosphate.  
  • CuratedUniProtKB
It is regulated in the following manner
Down-regulated by phosphorylation.  
  • CuratedUniProtKB
 

Keywords

Biological process 
Immunity  definition   [KW-0391]
Molecular function 
Hydrolase  definition   [KW-0378]
Protein phosphatase  definition   [KW-0904]
Technical term 
Reference proteome  definition   [KW-1185]
 

Further external links

GeneWiki: PTPN22
GenomeRNAi: 26191
PRO: PR:Q9Y2R2